To some extent that is unavoidable.
If you do try a match have a buddy video you. In as little as one season you will look back at the video and get a kick out of it. Even if you are an awesome shot you will most likely have the "wrong" gun, gear, ammo, etc etc...... It's that way with any game though.
But don't let any of your concerns keep you from getting out and at least try it. There are all kinds of shooters and skill levels but by and large most are great people who will be glad to help. In a match you are not trying to shoot groups. You are trying to hit the targets as fast as you can. Just do it!!